Expose Almanac to C++

[ChristopherRabotin]

High level description

As a stakeholder, I need the Almanac structure to be exposed to C++ so that file loading can be performed from C++ code.

Requirements

Expose the Almanac structure and the associated load function to C++ using the cxx Rust crate. The Rust load function takes a string and returns a copy of the Almanac using move semantics. It is critical to ensure that the move semantics do not lead to memory leaks when used from C++.

Test plans

• Implement C++ bindings for the Almanac structure.
• Expose the load function so that it is accessible in C++.
• Ensure that the Rust-side move semantics are preserved and do not cause memory leaks.
• Write C++ tests that verify the expected behavior and absence of memory leaks.
• Update the documentation with C++ usage examples and any caveats regarding memory management.